Measurement of higher-order harmonic azimuthal anisotropy in PbPb collisions at √sNN = 2.76 TeV
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Chatrchyan, Serguei; Brochero Cifuentes, Javier Andrés






Date
2014-04Derechos
Atribución 3.0 España © CERN, for the CMS Collaboration
Publicado en
Phys. Rev. C, Vol. 89, Num. 4, Pag. 044906 (2014)
Publisher
American Physical Society
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Abstract:
Measurements are presented by the CMS Collaboration at the Large Hadron Collider (LHC) of the higher-order harmonic coefficients that describe the azimuthal anisotropy of charged particles emitted in √sNN = 2.76 TeV PbPb collisions. Expressed in terms of the Fourier components of the azimuthal distribution, the n=3–6 harmonic coefficients are presented for charged particles as a function of their transverse momentum (0.3 < pT < 8.0 GeV/c), collision centrality (0% – 70%), and pseudorapidity (|η|<2.0). The data are analyzed using the event plane, multiparticle cumulant, and Lee-Yang zeros methods, which provide different sensitivities to initial-state fluctuations. Taken together with earlier LHC measurements of elliptic flow (n=2), the results on higher-order harmonic coefficients develop a more complete picture of the collective motion in high-energy heavy-ion collisions and shed light on the properties of the produced medium.
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